Operation has been confirmed with an adapter. We have not checked operation with batteries. We have checked all functions such as tone switching, rhythm output, etc. However, we are amateurs and may have overlooked some things, so please be patient. Please be aware that some repairs may be necessary. There are no accessories other than the main unit. Thank you for visiting! If you have any questions please leave a message. If that, please let us know within 3 days you got the item.